Mack does have many types and style of bruches , the blue ferrel 0 and 00 are good . The long handle series 250 in the 0 and 00 are long handle stripers that are good. You can get a catalog from them that has all there bruches and products.
I have a small variety of brushes from them, I think I used the 20 series the most though. They are cheap and easy to find around here. Everyone says the 10's are better though, and they are...but sometimes you make do with what ya got, right? The brush never makes the artist. Buy the 10's if you can get them easily though. Good luck.